Man, they really spun that feature. Almost every vista tips guide on the net mentions how you can check that box for improved performance. Clearly no one's ever benchmarked this, and the only source of truth is an obscure tech article from Raymond Chen.
Maybe DH could get some publicity "benchmarking" this feature and highlighting the article and exposing this fake vista tip.
edit: Blogged about it
Vista “Enable Advanced Performance” Benchmark at YAY! it’s Andrew!